diff --git a/src/libCom/osi/os/default/osdSpin.c b/src/libCom/osi/os/default/osdSpin.c
index 0f945d0f2..70d9fbace 100644
--- a/src/libCom/osi/os/default/osdSpin.c
+++ b/src/libCom/osi/os/default/osdSpin.c
@@ -10,6 +10,9 @@
  * Author:  Ralph Lange <Ralph.Lange@gmx.de>
  */
 
+#include <stdlib.h>
+
+#define epicsExportSharedSymbols
 #include "errlog.h"
 #include "epicsMutex.h"
 #include "epicsSpin.h"